Machine for bending sheet metal



Sept. l2, 1950 F. FENNELL MACHINE FOR BENDING SHEET METAL 2 Sheets-Sheet 1 Filed March 4. 1949 :E n y www? Sept. l2, 1950 F. FENNELL MACHINE EOE BENDING SHEET METAL 2 Sheets-Sheet 2 Filed March 4, 1949 vided withv openings 49.

.and then latching them bolts 42. By rotatingthe handle 51in aclockand slots 31 opening into the sockets. Mounted in these sockets 31 for adjustment therein are bearing blocks 38. These bearing blocks rotatably support a shaft 39 which extends transversely of the post 35. The bearing blocks 38 are adjustably arranged in the sockets 31 by screw shafts 49, each of which has as an integral part thereof a nger knob 4| and a latch bolt 42 for latching the screw shaft 40 in an adjustediposition;g` l 'I'hecarriage .plate 29 at its forward end provides a clamping jaw element 43 having its top surface arranged in the same plane as the horizontal flange 23 of the stiffening plate 2|. Cc-

operating with this jaw @rement 43 to hold 'the work to be bent is a jaw 44 secured as at45 to a supporting plate 46 formed as an integral part of a, sleeve 41. This sleeve 41 embraces the post 35 for movement opposite side walls 48 of this sleeve 41 are pro- 'The shaft 39 provides trunnions 501 These l V.trunnions 50 are eccentrically mounted with respectto the long axis of shaft 39. Mounted l 1 50 are blocks, 5L These blocks 5 1 are arranged forrslidable movement in" guide grooves 52 provided in cover plates 53 for the openings, 49. V y

cured to the adjacent'side walls 48 of the .sleeve 1 u assi, 5a.r

these trunnions These cover plates 53 lare se- The oppositeside walls 55Vo f the sleeve 411are` provided with aligned slots 56 arranged in alignment with a space betweenthe ,plates for 'the Arffceptionpf a handle 51; This vhandle 51 .is secured as at 59 to theshaft 39'.

In operation, the screwshafts 49 are adiosted" with respect to' the bearing blocks 38 'tojpermit Ythejaw 44 to be spaced from the jaw 43,adistance slightlygreater than thethickness of the metal. to be bent.` This in place by the latch wise vdirection as viewed in Fig.V 4the .bearing blocks aa will be eievatec into contacrwah the,...

screwv shafts 40, whereuponpn furtherrotation l of the shaftY 39 by manual operation of the handle .51, the sleeve 41 willfbe'moved upwardly relative .tothe post 35, disposing the j aw'44 apredeter- `mif1eddistanoe.fronrthe'javvV 43. The oppositefflongitudinal ledges ofl the,..car

-. ria'geplate A29 are provided'intheir top r'st iiffa'ces N withA guiding grooves 60., In .these grooves -Bll forqlongitudinal movement with .respectfthereto 11Aare blocks El connected to the carriage plate 29 `by bolt andslot connection 62. Eachof these blocks 6i carriesadimiting. vbar 63 having Ian undercut portion providing a stop shoulder. I By adjusting theflimiting bar 63 'relative to the carriage plate 29, the Work to be cperated'fupon 1 Lmay -be accurately positioned with lthe lineof the *.bendproperly'related to the jaws-43 and144.

' By, adjusting Athecarriage1plate29 relative to .the base |0,-the jaw 43-may be disposedA a distance from the blade.l I9 equivalent: to the thickness of the sheet to be folded, thereby to properly locate the bending blade i9 with respect to -.the line of fold of the material to Vbe bent,v with the result that an accurate folding operation may be performed according to the desired vlocation :of the line of fold or bend Without-such arrangement, it is clearly obvious thatthe Vbend might take place on a line short ofthe predetermined'line of bend of the work. f

This bending' operation isfaccomplishedg n is accomplishedby ad-h. justing the screws 49 relative to the plates, 35-

* especially useful for bending the lend portions of relative thereto. `The the side walls of metal boxes, which end portions vare bent to overlap the side walls of such boxes and corners. The device is especially useful in connection with small bending operations and is. capable of operating upon relatively thick material. Itis sturdy, comprising the minimum number of parts, which affords economical manufacture.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation ,and modification without -departing frqmthe spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth,y but desire to avail myself .o f. such variations and modifications .as come within the scope. of theappended claims.

Having vthus described my invention, what I claim as newanddesire toprotect by Letters Patentie: Y y, f

l. For a combination comprising a basefhaving a recess formed therein substantially semi-cir- .cular in side elevation and. a groove extending l.around said recess and substantially Tashaped 3 inzcrosssection, a mounting block mounted for .rotation about a horizontal axis within said recess and provided with a T-shaped'ribmou'nted for movement in the groove, said mounting block carrying a bending blade, a gripping structure movably carried bythe base and. including a v post extending upwardly therefrom, a sleeve embracing the post and movable yrelative thereto,

.said gripping structure including .afjaw carried by saidvstructure in cooperative'relationwith respect-.to the. bending blade and a jawl carried 'by the sleeve in cooperativerelation with. respect to said rst-namedjaw, means for rctatirigsaid yblock and said blade relative to said `jaws,. and means for moving said sleeve relative toz lsaid post to move the jaw carriedthereby into work- :gripping position with respect to theiaw carried by said gripping structure.

r 2. For a combination comprising a base having .rotation about aj horizontal `(i0 ai recess formed therein substantially semicircular in side elevation and ra Vgroove extending around saidrecess andbsubstantially `T-sl-iaped in cross section-amounting blockv montdfor axis within said recess and provided with a T-shaped Iibmounted for movement in the groove, said mounting block carrying a bending blade, a gripping structure `movably carried by` the base 4and including a post extending upwardly therefrom, a sleeveembracing the 'post and4 movable relative thereto, said "gripping structure including a jaw carried by said structure. in cooperative relationlwith respect to the bending blade and a jaw carried by the sleeve in cooperative relation withrespect to said first-named jaw, means for rotating said block and said blade relative to said jaws, means Iposition with respect to .75- gripping structure,I and Kfor moving said sleeve relative -to saidppostto move the jaw carriedthereby into work-.gripping the jaw carried by said means for adjusting said gripping structure relative to said base to vary the relative position between the jaw carried by saidstructure and said bending blade.

3. For a combination comprising a base having a recess formed therein substantially semicircular in side elevation and a groove extending around said recess and substantially T-shaped in cross section, a mounting block mounted for rotation about a horizontal axis within said recess and provided with a T-shaped rib mounted for movement in the groove, said mounting block carrying a bending blade, a gripping structure movably carried by the base and including a post extending upwardly therefrom, a sleeve embracing the post and movable relative thereto, saidv gripping structure including a jaw carried by said structure in cooperative relation with respect to the bending blade and a jaw carried by the sleeve in cooperative relation with respect to said rst-named jaw, means for rotating said block and said blade relative to said jaws, means for moving said sleeve relative to said post to move the jaw carried thereby into work-gripping 15 Number Name Date 72,478 Gleason Dec. 24, 1867 677,933 Bright July 9, 1901 1,194,602 Curtis Aug. 15, 1916 1,382,464 Blum June 21, 1921 30 1,744,391 Kuehn Jan. 21, 1930 2,025,360 Simmons Dec. 24, 1935 2,401,031 Wanasek May 28,1946 2,438,319 Kilham Mar. 23, 1948 6 position with respect to the jaw carried by said gripping structure, means for adjusting said gripping structure relative to said base to vary the relative position between the jaw carried by said structure and said bending blade, and means for latching said gripping structure in an adjusted position with respect to said base.

FRANK FENNELL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

